HUH? I shoot concerts all the time in clubs and large theaters. I use a 70-200 f2.8 as the go to lens.... at ISO 1600 @ f11! So an f4 can get the shot at 1/30 - ISO 1600 or 3200 no problem. Using a tele will actually have better exposure in low light, since you can zoom in on the players -- where the light tends to be. The wider the lens, the more "black" you will have on stage.
If you're talking about photography, then yes, those settings work, but the video implementation on most dSLR cams sucks and they don't have as much light sensitivity. Can you really expect usable results from an ISO3200 video, let alone 1600?
Of course good exposure depends on available light as well; it could be a dark, but well-lit stage, or a total rat's nest.
Haha, this is actually a neat trick to use if you're going to be compositing and want that effect where you have several vertical strips of video going side-by-side, and since you're down-sizing from HD the image appears sharper too.